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Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

 

Readings on 02 Dec 2014

View reading for:

Region 24-hr Sulphur dioxide
(µg/m3)
24-hr PM10
(µg/m3)
1-hr Nitrogen dioxide
(µg/m3)a
8-hr Ozone
(µg/m3)
8-hr Carbon monoxide
(mg/m3)
24-hr PM2.5
(µg/m3)
North 10(7) 28(28) 38(-) 18(8) 0.4(4) 17(56)
South 43(27) 22(22) 55(-) 13(6) 0.3(3) 12(50)
East 24(15) 20(20) 31(-) 35(15) 0.2(2) 15(54)
West 7(4) 24(24) 43(-) 37(16) 0.3(3) 12(51)
Central 29(18) 23(23) 60(-) 22(9) 0.5(5) 14(53)

1-hr PM2.5 (µg/m3)b Readings on 02 Dec 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 19 17 15 14 12 18 11 11 26 24 13 13
South 6 8 11 14 7 10 9 6 10 21 22 23
East 9 15 14 20 20 22 19 16 13 16 19 19
West 9 11 12 14 21 17 28 25 12 10 9 15
Central 11 15 16 15 15 18 16 14 18 16 8 17
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 20 16 18 18 19 8 12 9 17 9 10 -
South 20 15 13 13 19 10 8 7 7 11 9 -
East 24 20 15 11 17 12 10 11 7 7 10 -
West 15 16 9 7 7 4 2 11 12 15 8 -
Central 22 20 12 11 19 8 9 11 8 12 10 -

Note:
a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on 02 Dec 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 40 49 52 53 54 55 56 55 55 55 55 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 58 57 53 53 51 45 37 39 43 42 -

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.